T-Mobile’s approach to selling the phone is a bit different, thanks to its recent plan to drop subsidies. Instead of a two-year contract with a subsidized price, qualified T-Mobile customers can get the 16GB iPhone 5 for $100 upfront, plus monthly payments of $20 for 24 months. The 32GB and 64GB iPhone 5 models, which will only be available online, will sport down payments of $200 and $300, respectively.

In addition, T-Mobile is also offering similar arrangements for the iPhone 4S and iPhone 4 “in select markets.” The older iPhones will be available for $70 and $15 down payments, respectively; while the 4S will also require $20 monthly payments over two years, the iPhone 4 only runs $15 per month.

With those monthly payments, the prices of the handsets work out to $580 for the iPhone 5, $550 for the iPhone 4S, and $315 for the iPhone 4. By comparison, an unlocked 16GB iPhone 5 will cost you $649 from Apple, an unlocked 16GB iPhone 4S will cost you $549, and an unlocked 16GB iPhone 4 will cost $450. Note, however, that unlike Apple’s unlocked offerings, T-Mobile’s phones are only unlocked once customers have paid off the balance they owe T-Mobile. Engadget has reported that the T-Mobile iPhone will be a slightly different version of the model currently sold for use on AT&T in the U.S., and that existing versions of that model (number A1428) will not be compatible with use on T-Mobile. Apple had not responded to a request for comment on that matter at the time of this writing.

A T-Mobile spokesperson confirmed to Macworld that customers who cancel their service before those 24 months are up must pay off the balance by the end of 24-month period.

Of course, you’ll still need a service plan, and T-Mobile is ready for you there: The carrier’s offering a $50 monthly plan of unlimited talk, text, and data—the catch being that only the first 500MB of that data is on the 4G network. For more 4G data, you can pay $10 per month per line for an additional 2GB or $20 per month per line for unlimited 4G data. Once you exceed that 4G data, you presumably fall back to slower speeds, like EDGE.

The company also said on Tuesday that it is launching its 4G LTE network in seven more markets—Baltimore; Houston; Kansas City; Las Vegas; Phoenix; San Jose, Calif.; and Washington, D.C.—and aims to reach 200 million people by the end of 2013.

T-Mobile’s also offering a few extras with its service: The carrier says it will be the first in the U.S. to offer nationwide HD Voice for the iPhone 5, will package 500MB of 4G tethering for its customers, and will support the ability to use the voice and data connections of the phone simultaneously—a featured offered by AT&T, but not Verizon or Sprint.

Dan Moren Contributor

Dan has been writing about all things Apple since 2006, when he first started contributing to the MacUser blog. Since then he's covered most of the company's major product releases and reviewed every major revision of iOS. In his "copious" free time, he's usually grinding away on a novel or two.More by Dan Moren